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Change in the stand structure of a natural fir hemlock hardwood secondary mixed stand in the ehime university forest japan i. development of the growing stock of the main stand from 1968 1980 analysis from the viewpoint of management by the check method



Change in the stand structure of a natural fir hemlock hardwood secondary mixed stand in the ehime university forest japan i. development of the growing stock of the main stand from 1968 1980 analysis from the viewpoint of management by the check method



Bulletin of the Ehime University Forest (25): 1-14



In order to establish a management model of a natural fir-hemlock-hardwood secondary mixed forest, we have been observing and recording stand dynamics since 1968 in the Ehime University Forest at Komenono. Matsuyama, Ehime Prefecture, Japan. This report deals with the development of the growing-stock of the main stand (trees of d.b.h 7 cm and over) from 1968 to 1980. (1) The number of stems recruited out of the underwood (trees under d.b.h. 7 cm) into the main stand decreased. The recruited stems per ha were 125 stems in the period from 1968 to 1974 (Period I) and 80 stems in the period from 1974 to 1980 (Period II). The greater part (95%) of those was a hardwood, and no recruitment of hemlock was found. (2) The mortality increased. The number of dead standing stems per ha observed was 59 stems in Peirod I and 68 stems in Period II. The diameters of the dead standing stems were generally under 13 cm, and the majority of which were smaller size. About 80% was hardwood. (3) The diameter increment recorded was greater in the larger diameter-class. The mean diameter increment of Diameter-class V (conifers) was 5.apprx.6 mm/year. The growth of hemlock under d.b.h. 20cm was very slow, i.e. the diameter increments of half of those were only 1mm in 6 years (Period II). The hardwoods showed greater increment than similar sized conifers. (4) The growing-stock of the main stand per ha in 1968, 1974 and 1980 was 414 sv, 471 sv and 535 sv, respectively. Taking the mortality into account, the mean growing-stock increment per ha was 10.apprx.11 sv/year.

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